General

Engineer's Note

This Samsung M393A2K40CB2-CVFBQ 16GB DDR4-2933 RDIMM combines ECC and registered signaling to ensure data integrity and signal stability in dense, multi-DIMM server platforms, making it well-suited for virtualization, in-memory databases, and other mission-critical workloads that cannot tolerate silent data corruption. Its single-rank x4 organization at CL21 delivers balanced latency and bandwidth while reducing the electrical load on the memory channel, allowing higher per-channel population for scalable performance.

Technical Specs & Insights

1. ECC memory detects and corrects single-bit errors in real time, shielding financial transactions and critical workloads from data corruption in 24/7 operation.
2. Registered DIMM architecture buffers command and address signals, enabling stable operation across densely populated memory channels for large-scale virtualization.
3. A 16GB module provides the headroom needed to run multiple virtual machines and memory-hungry databases without swapping, maximizing consolidation ratios.
4. 2933 MT/s throughput accelerates data-intensive analytics and in-memory caching, reducing latency for enterprise applications under heavy load.
5. 1.2V low-power DDR4 design reduces overall server energy consumption and thermal output, lowering cooling costs in large-scale data centers.

Why These Specs Matter

The Samsung M393A2K40CB2-CVFBQ is a DDR4-2933 Registered ECC module engineered for server workloads. Its ECC actively corrects single-bit errors, which is non-negotiable in virtualization clusters where an undetected bit flip can corrupt a hypervisor or silently alter transactional data in an in-memory database like SAP HANA. The registered buffer re-drives signals, letting you fully load 24 DIMM slots per server for enormous memory capacity without compromising stability—meaning you can safely run more VMs per host. The 2933MT/s speed paired with single-rank x4 architecture delivers the sustained bandwidth that real-time analytics and Redis demand, while the x4 organization supports advanced Chipkill, keeping the system online even if a whole DRAM chip fails. Operating at just 1.2V, this module significantly cuts power and cooling costs across dense rack deployments, which is crucial for hyperscale environments. Every characteristic directly protects your uptime and budget.

Endurance & Reliability

General Virtualization
For moderate consolidation, deploy six to eight of these 16 GB RDIMMs per dual‑socket host (96–128 GB total) to comfortably run 15–25 virtual machines with balanced overcommit. Populate all memory channels symmetrically—one DIMM per channel—to maintain full 2933 MT/s speed and avoid latency penalties. Leave at least two slots free per CPU for future scaling without replacing existing modules.

In-Memory Database
Maximise capacity and interleave by filling every channel with a single‑rank RDIMM; a two‑socket server with 12 modules provides 192 GB, suitable for midsized Redis or SAP HANA footprint. Use identical single‑rank x4 parts to sustain wide‑bank refresh efficiency and keep CL21 latency consistent under heavy random access. Monitor NUMA boundaries and place data close to the accessing core to avoid remote memory stalls.

High‑Performance Computing (HPC)
Configure one DIMM per channel across all eight or twelve memory channels to deliver peak bandwidth for memory‑bound simulation codes. This 1‑DPC population with 2933 MT/s registered ECC RAM yields the lowest transaction latency while retaining error resilience for multi‑day compute runs. Scale total capacity to 128–192 GB per node, ensuring massive datasets fit in‑memory without swapping, which is critical for MPI‑based workloads.

Verified Compatibility

Validated for server: rigorously tested, compatible with Dell PowerEdge R740, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650.

FAQ